Boneheads

The Boneheads (or Domeheads) are the Pachycephalosaurus and minor antagonists in The Land Before Time,The Land Before Time IV: Journey Through the Mists and The Land Before Time TV show. They are seen attacking Cera in the volcanoes (or the Mountains that Burn). In the fourth film, Journey Through the Mists, they are seen headbutting each other, much to Petrie's nausea.